Earlier screening for family history or Lynch syndrome
A close relative with colorectal cancer doubles your risk; inherited syndromes change the plan.
What studies found
The National Cancer Institute says a parent, sibling or child with colorectal cancer doubles risk. For Lynch syndrome, the American Cancer Society advises colonoscopy every 1 to 2 years from the early 20s, or 2 to 5 years before the youngest diagnosis in the family; lifetime colorectal cancer risk ranges from about 10% to 80% depending on the gene. Familial adenomatous polyposis (FAP) carries a lifetime risk of nearly 100%, with screening from age 10 to 15.
The catch
The right start age and interval depend on your family details.
What to do
Tell your doctor about colorectal and related cancers in your family, and ask whether you should start earlier or see a genetic counselor.
Sources
Rung 4 of 5, Strong: At least one large randomized trial, or very large consistent studies, on this exact question. How we score
Step by step
For the whole picture, from prevention and screening to treatment and life after, see the colorectal cancer page.
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